Gyratory ore grinder



Patented Mar. 1, 1924.

warren stares LEWIS MARTIN KELLOGG, OF SOUTH PASADENA, CALIFORNIA.

GYRATORY ORE GRINDER.

Application filed January 19, 1920.

To all whom it may concern.

Be it known that I, Lnwis MARTIN KEL- LOGG, a citizen of the UnitedStates, residing at South Pasadena, in the county of Los Angeles andState of California, have invented new and useful Improvements inGyratory Ore Grinders, of which the following is a specification.

My invention relates to improvements in ore grinders in which thegyratory principle in common use in rock-breakers is applied for thegrinding of broken .ore to sands and slime and an object of my inventionis to make a gyratory mill of such form that a sands or a slime productmay be had fromit; a second object being to provide a certain flow ofthe feed water through the mill whereby the finely ground ore particlesfrom all parts of the Zone in which the grinding is done will beclassified upwardly to an overflow discharge, and a third object beingto so form and arrange the grinding elements that the ore will not becrushed between steel surfaces directly but rather ore will be crushedupon ore in a bed compressed between steel crushing surfaces.

The invention consists of the novel fea- More specifically 1 indicates amortar heavy walled and having a removable bot tom plate 2. The mortaris surrounded with an annular discharge channel 8 and has an overflowdischarge rim 4.

Within the mortar is positioned a steel wearing liner 5 having an upperand a lower crushing ring 6 and 7 and air-intermediate channel 8 oflarger diameter forming part of a grinding zone.

A water inlet conduit 9 is connected to the bottom plate at the centerand communicates with the interior of the mortar by a plurality of ports10.

An ore feed hopper 11 is fixed to the back side of the mortar and has aspout 12 leading through the wall thereof and into the intermediatechannel 8.

Secured to lugs 13 on the topof the mortar is a spider 14 in which isformed an Serial No. 352,260.

eccentric bearing 15 disposed concentric with the mortar.

Within the bearing 15 is rotatably mounted an eccentric 16 havinganouthanging driving pulley 17 and an eccentric rectangular cavity 18.Within the cavity 18 is positioned blocks 19 and 20 in which is formed asocket bearing.

WVithin the mortar is placed a gyrator 22 carrying a steel shell 23, theshell being formed with an upper ring 24 opposing the ring 6 of themortar liner and a lower ring 25 opposing the lower ring 7 of the mortarliner, and having an intermediate channel 26 opposite the channel 8 ofthe mortar liner.

The gyrator is provided with a spindle 27 having a ball 28 at its upperend adapted to-journal in the socket formed in the blocks 19 and 20.

In the practical operation of the device a power belt over the pulley 17will rotate the eccentric 16 and gyrate the gyrator 22 through thespindle 27. In its movement the upper ring21 of the gyrator willapproach the upper ring 6 of the mortar on one side while the lower ring25 of the gyrator will approach the lower ring 7 of the mortar on theopposite side.

If then ore, which has been previously broken to about one inch andfiner, is fed to the mortar through the hopper 11 and spout 12 the orewill fill the intermediate zone 8, 26 and work into the crevices betweenthe upper and lower sets ofrings.

It is not intended that the crushing rings shall contact with each otherbut that they shall approach to within a proper distance so that the orepieces will form a bed between the rings and so that the ore pieceswill, to a certain extent, be crushed upon other ore pieces rather thanbetween the steel surfaces directly. I i

The crevices between the'upper and lower sets of rings open and close ina rotating cycle and the ore is not only ground between the rings butthe ore pieces filling the intermediate zone 8, 26 are also continuouslyin motion all around the mill, being alternately compressed andreleased.

Simultaneously with the grinding of the ore water is entered into themortar through the ports 10. The water passes outwardly from under thegyrator and upwardly through the crushing zone all around the milldischarging over the rim 4:. The water in its passage up through the orecarries with it that part of the ore which has been ground fine enoughto classify out of the crushing zone and be buoyed up by the ascendingcurrent. 1

The fineness of the product delivered by the mill will depend upon theheight of the rim 4 and the amount of feed water admitted. By this meansa closely classified product is delivered.

The gyrator is suspended in the mortar and its gyrations may not beperfect or uniform, that is, the gyrator may, on account of extra heavyduty imposed on one side or the other between the top or bottom rings,be thrown off center or move too far to one side or the other and allsuch eccentricities of gyration are accommodated in the ball and socketbearing in the eccentric 16.

The ore is crushed in this mill. in a manner similar to the breaking ofrock in the conventional gyratory rock breaker except that in the latterthe ore is broken along the spindle between the eccentric and an outerpivotal bearing, thus employing a leverage of the second class, while inthe present invention the pressure of the lower crushing ring on the oreis used as a fulcrum to effect a crushing of the ore at the upper ring,thus crushing the ore at two points and using a leverage of the firstand second class.

The grinding action in the intermediate zone is effected in a mannersimilar to that set up in a conventional tube mill in which the largerore pieces sliding upon each other grind themselves away and the smallerpieces between them.

The feed of ore to. the mill is effected through the spout 12 and themovement of the ore in the intermediate zone influences the ore in thespout so that the ore continually works down into the mill as fast asthere is room for it.

The hopper 11 is carried up to a level above the rim 4 so that the millwater filling into the spout will not overflow by that means.

The hopper may be supplied with ore from a mechanical feeder or from anin.- clined chute and if from the latter the ore simply fills into thehopper and works down into the mill as fast as the mill disposes of it,thus forming an automatic feed.

It is to be understood that air may be entered into the mill in place ofthe feed water and the mill run as a dry grinder, the air acting toclassify upwardly the fines as fast as the mill produces them. Such anarrangement, it is obvious, would necessitate the use of an exhaust fanand a settling chamber to carry away from the mill and collect thepulverulent product.

With some trouble and at the sacrifice of simplicity the gyrator may beinverted and the spindle extended through the bottom of the mortar as isthe common practice in gyratory rock breakers, but the construction asherein shown is preferred and various other changes might be made in thestructure of the mill and the arrangement of the several parts withoutdeparting from the spirit of the invention as claimed.

Having thus described my invention I claim:

1. In combination in a gyrator-y ore grinder, a mortar having aremovable wearing liner comprising an upper and a lower grinding ringproperly spaced to form a wide intermediate grinding zone, a gyratordisposed freely and floating in the mortar and having a removablewearing shell comprising an upper and a lower grinding ring adapted tooppose the upper and lower grinding rings of the mortar liner, the ringsbeing properly spaced to form a wide intermediate grinding zone, meansfor feeding ore pulp to the mortar, means for admitting to the mortar afluid vehicle for the pulverized ore, and means for gyrating thegyrator.

2. In combination, in a gyratory ore grinder a mortar having a removablewearing liner comprising an upper and a lower grinding ring properlyspaced to form an intermediate grinding zone, a gyrator disposed freelyin the mortar and having a removable Wearing shell comprising an upperand a lower grinding ring adapted to oppose the upper and lower grindingrings of the mortar liner, the rings being properly spaced to form anintermediate grinding zone, means for feeding broken ore through thewall of the mortar into the in termediate grinding zones, means foradmitting to the mortar a fluid carrier for the pulverulent product, andmeans for gyrating the gyrator.

3. In a gyratory ore grinder, in combination, a mortar having an. innerwearing liner and comprising an upper and a lower grinding ring spacedapart, a gyrator suspended freely in the mortar and having a wearingshell comprising an upper and a lower grinding ring adapted to opposethe upper and lower grinding rings of the mortar liner, means foroperating the gyrator, means for admitting water to the mortar and meansfor feeding ore to the mortar.

4. In combination, in a gyratory ore grinder, a mortar having anoverflow discharge and having a removable wearing liner comprising anupper and a lower grinding ring properly spaced to form anintermediategrinding zone, a gyrator disposed freely and floating withinthe mortar and having a removable wearing shell comprising an upper anda lower grinding ring adapted to oppose the upper and lower grindingrings of the mortar liner, the rings being properly spaced to form anintermediate grinding zone, means for operating the gyrator, a feedwater inlet for the mortar, an ore feed port connecting through the wallof the mortar and through the liner into the intermediate grinding zonebetween the upper and lower grinding rings and means for feeding ore tothe mortar through the port.

5. In a gyratory ore grinder in combination, a mortar having an overflowdischarge and having a removable wearing liner comprising an upper and alower grinding ring properly spaced to form an intermediate grindingzone a gyrator disposed freely and floating within the mortar and havinga removable wearing shell comprising an upper and a lower grinding ringadapted to oppose the upper and lower grinding rings of-the mortarliner, the rings being properly spaced to form an intermediate grindingzone, means for passing a classifying fluid upwardly through thegrinding zones and between the rings and towards the overflow discharge,means for gyrating the gyrator and means for feeding broken ore to themortar.

6. In combination in a gyratory ore grinder, a mortar having an innerwearing liner comprising an upper and a lower grinding ring, a gyratorsuspended freely in the mortar and having a wearing shell comprising anupper and a lower grinding ring adapted to oppose the upper and lowergrinding rings of the mortar liner, an ore inlet port extending throughthe wall of the mortar and between the upper and lower sets of grindingrings, a water inlet for the mortar and means for operating the gyrator.

7 In a gyratory ore grinder, in combi nation, a mortar, a removablewearing liner for the mortar having an upper and a lower grinding ringspaced apart, a gyrator adapted to gyrate freely in the mortar and aremovable wearing liner for the gyrator having an upper and a lowergrinding ring adapted to oppose the upper and lower grinding rings ofthe mortar liner.

8. In combination in a gyratory ore grinder, a mortar having an innerwearing liner comprising an upper and a lower grinding ring, a gyratorsuspended freely in the mortar and having a wearing. shell comprising anupper and a lower grinding ring disposed so as to oppose the upper andlower grinding rings of the mortar liner, an ore inlet port extendingthrough the wall of the mortar and between the upper and lower sets ofgrinding rings, a water inlet for the mortar positioned below the setsof grinding rings, an overflow discharge rim for the mortar and meansfor operating the gyrator.

9. In combination in a gyratory ore grinder, a mortar having a removablewearing liner, an ore inlet port formed through the wall of the mortarand through the wearing liner, a gyrator adapted to gyrate in suspensionin the mortar and having a removable wearing liner opposing the wearingliner of the mortar, an overflow discharge rim for the mortar, and awater inlet means positioned in the bottom of the mortar.

In testimony whereof I have signed my name to this specification.

LEWIS MARTIN KELLOGG.

